Process of deinking paper



Patented Sept. 29, 1925.

UNITED .STATES PATENT OFF-ICE.

EMIL KELLNER, O'F KALAMAZOQ, MICHIGAN..

PROCESS or nnnifkme PAPE No Drawing.

provements in Processes of Deinking Paper,

of which the following is a specification. The present invention relates to the process of removing ink from printed paper, in-

eluding newspaper, and also for removlngthe wax from waxed paper.

In accordance with the present invention, I place the Waste paper, say news or printed book paper, say 2,000 pounds, into a beater, and with water in the amount usually em ployed in making a pulp, and the mixture is thenheated (e. g. by blowing in steam). up to about 75 C. I then allow the heater to run until the stock has been reduced to fine uniform pul and I then add 100 pounds of f soda ash, and again "apply'heat until the temperature goes up about 90 C. Ithen add a solution of 20 poundsiofchloride of lime in water, together with a suspension of -2 5 pounds of finely pulverized sulphur in;

water, after W'hichthe beater *can be'allowed to run for half an hour or so, at the end of which time it will be found that the ink and the filler or loading material have been completely se arated from the paper stock,-and

the stock eft in a clean state. The pulp is then washed in the well known or any suitable manner until all of the chemicals are Application filed August 22, 1924. Serial No. 733,880.

washed out. The washing operation may require abouttwo hours. a I It will be seen that the chemicals used are relatively cheap materials, and that the cost for extra labor is extremely low, so that the entire cost of recovering the paper is very small. A good yield ofiptilp is secured. I 4 A particular advantage of my process is that it is also applicable to waxed paper, whether 'or not the same contains pr nting thereupon, the operation oftreating waxed paper being precisely the same as above stated.

It will be obvious that after the washing the pulp can be run into sheets of the desired thickness, either alone or wit-h other paper stock, or can be used inany other manner.

I claim: e

1. The process which comprises pulping waste paper. to be reworked at about (3., adding soda ash, heating to about 909 (1., and mixing, then adding chloride-of lime 55 and sulphur, and again beating for a short period,-and washing. '2. A process which comprises pulping waste paper in warm water, adding soda and heating up to about (3., and there-- 60 after mixin chloride of lime and sulphur witih the pn p, and.- thereafter washing the pu p. j

In testimony whereofI afiix rny signature.

-' mun KELLNER. 

